application · Nutrient: content · Olea europaea (common olive)

Papers reporting a positive result 19

1. Foliar application of urea to almond and olive: Leaf retention and kinetics of uptake · 1985

   • positive
     Five 2% urea applications increased olive leaf nitrogen content by 47% with minimal phytotoxicity.

2. Leaf Potassium Accumulation in Olive Plants Related to Nutritional K Status, Leaf Age, and Foliar Application of Potassium Salts · 2009

   • positive
     Foliar 2% or 4% KCl increased K content in poorly K nourished olive plants.
   • positive
     Two foliar applications raised olive leaf K above the sufficiency level.

3. Response of young olive trees Olea europaea L. Sourani variety to foliar application of amino acids , organic acids and boron · 2011

   • positive
     Selector-x and boron increased leaf K content.
   • positive
     Selector-x and boron increased leaf boron content.
   • positive
     Selector-x and boron increased leaf P content.
   • no effect
     Selector-x and boron did not affect N.

4. The Effect of Errigation Water Source and Nutrient Solution of Polixal on the Growth of Olive Seedlings cv. Khestawe · 2014

   • positive
     Combining river or ground water irrigation with 8 cm3 L-1 Polixal spraying significantly improved olive characteristics, including leaf mineral content.

5. Response of Gemlik Olive Trees to Soil and Foliar Treatments of Iron in Combination with Zinc and Boron · 2015

   • positive
     Foliar applications of double and triple combinations of iron sulfate with zinc sulfate and borax significantly increased B and Zn concentrations in olive.
   • positive
     Foliar applications of iron sulfate considerably elevated leaf total and active Fe concentrations in olive.
   • no effect
     The effect of foliar iron sulfate on fruit Fe concentrations in olive was small.
   • no effect
     Soil application of iron sulfate did not increase Fe concentrations in olive leaves and fruits.

6. Effects of Soil and Foliar Treatments of Alone and Combined Applications of Boron with Iron and Zinc on Boron, Zinc, and Iron Contents of Gemlik Olive Trees · 2016

   • positive
     Foliar borax increased leaf and fruit B concentrations.

7. Foliar Applications of Zinc and Boron on Fruit Set and Some Fruit Quality of Olive · 2016

   • positive
     Nutrient solution spraying significantly increased leaf and fruit B and Zn concentrations.

8. ROLE OF GROWTH REGULATORS BRS AND CPPU IN GROWTH AND LEAVES MINERAL AND HORMONAL CONTENT OF OLIVE TRANSPLANTS · 2018

   • positive
     BR spray at 2 mg L-1 gave the highest leaf nitrogen content (1.169 %) in Nebali olive.

9. Soil and foliar applied boron in olive: tree crop growth and yield, and boron remobilization within plant tissues · 2019

   • positive
     In Arbequina, sprayed older leaves had higher boron levels than subsequently developed young leaves.

     compared with young leaves that developed thereafter

   • positive
     Foliar boron spray significantly increased tissue boron concentration in all experiments.

10. Calcium applications throughout fruit development enhance olive quality, oil yield, and antioxidant compounds' content · 2020

    • positive
      Calcium foliar treatments decreased sodium and potassium in olive fruit.
    • positive
      Calcium foliar treatments increased fruit calcium content in olive.

    cited by 1 paper here

11. Effect of boron spray at different phenological stages on fruit set, mineral composition, and carbohydrates content of three olive cultivars · 2021

    • positive
      Koroneiki had the highest leaf and inflorescence boron content with boron sprays at stages 1+3 or 2+3.
    • positive
      Koroneiki had the highest leaf and inflorescence zinc content after boron sprays at stages 2+3.
    • positive
      Baladi had the highest leaf iron content when sprayed at stage 2.

12. Importance of potassium and phosphorus in winter fertilization for olive trees · 2022

    • positive
      Spraying MKP at 4% improved olive leaf nitrogen content relative to control.

      compared with control

13. Beneficial effect of organic liquid fertilizer on growth of some olive seedling cultivars · 2022

    • positive
      Pigeon manure tea every 30 days maximized leaf nitrogen, potassium and phosphorus.

14. RESPONSE OF OLIVE TREES CULTIVAR AL-ASHRASSI TO NUTRITION WITH CHELATED IRON (CHI) AND DRY YEAST EXTRACT (DYE) · 2022

    • positive
      Foliar dry yeast extract at 20 g L-1 increased iron concentration in olive leaves.
    • positive
      Foliar chelated iron at 200 mg L-1 increased iron concentration in olive leaves.

15. Response of Olive Trees (Olea europaea L.) cv. Zaity to Bio health and Foliar Spray of Tecamin max and Boron · 2024

    • positive
      Foliar boron spray, especially at 300 mg/L, significantly increased leaf mineral content (N, K and B%) of olive relative to the comparison treatment.

      compared with comparison treatment

    • positive
      Foliar spraying of the amino acid tecamin max at 15 ml/L significantly increased leaf mineral content (N, P, K and B%) of olive relative to the control.

      compared with control treatment

16. Effect of spraying with nanofertilizer and adding biofertilizers on some chemical traits of two cultivars of olive seedlings · 2024

    • positive
      Spraying nano-fertilizer at 2 g/L gave the highest leaf zinc content (35.25ppm) versus the no-add treatment (24.52ppm) in olive seedlings.

      compared with no-add treatment

    • positive
      Spraying nano-fertilizer at 2 g/L gave the highest leaf nitrogen content (2.26%) versus the no-add treatment (1.96%) in olive seedlings.

      compared with no-add treatment

    • positive
      Spraying nano-fertilizer at 2 g/L gave the highest leaf phosphorus content (0.42%) versus the no-add treatment (0.34%) in olive seedlings.

      compared with no-add treatment

    • positive
      Spraying nano-fertilizer at 2 g/L gave the highest leaf iron content (99.32) versus the no-add treatment (91.26 ppm) in olive seedlings.

      compared with no-add treatment

17. Optimizing Olive Production: The Role of Foliar Fertilizers in Boosting Yield and Quality · 2024

    • positive
      Foliar fertilizer applications improved the fruit nutrient content of olive.

      compared with basic fertilization

    cited by 1 paper here

18. Response of some mineral content characteristics of young Olive tree leaves (cv. Arbequina) to spraying with Potassium and Chelated Iron · 2026

    • positive
      Chelated iron at 300 mg L-1 significantly increased leaf iron; 135.03 mg kg-1.
    • positive
      Chelated iron at 300 mg L-1 significantly increased leaf potassium; 5.29%.

19. Foliar application of nano-NPK and calcium-boron during the ‘off-year’ season enhances yield, improves oil quality, and mitigates biennial bearing in ‘Picual’ olive cultivar · 2026

    • positive
      Foliar NPK-NF and CaB-NF increased leaf and fruit calcium concentrations in treated trees.

    cites 2 papers here